CISCO-SA-ESA-SMIME-DISC-DZW4REDY
Vulnerability from csaf_cisco - Published: 2026-09-02 16:00 - Updated: 2026-09-08 11:22Summary
Cisco Secure Email Secure/Multipurpose Internet Mail Extensions Ciphertext Decryption Vulnerabilities
Notes
Summary: Multiple vulnerabilities in the Secure/Multipurpose Internet Mail Extensions (S/MIME) decryption functionality of Cisco Secure Email could allow an unauthenticated, remote attacker to recover plain text from encrypted email messages.
These vulnerabilities are due to insufficient validation of message integrity. An attacker could exploit these vulnerabilities by using a machine-in-the-middle technique to intercept and modify traffic between email gateways. A successful exploit could allow the attacker to obtain plaintext content from the encrypted communication.
There are no workarounds that address these vulnerabilities.
Vulnerable Products: At the time of publication, these vulnerabilities affected Cisco Secure Email devices if they were running Cisco AsyncOS Software Release 16.5.0 or earlier and had S/MIME configured for communication between email gateways.
See the Details section in the bug ID(s) at the top of this advisory for the most complete and current information.
Products Confirmed Not Vulnerable: Only products listed in the Vulnerable Products ["#vp"] section of this advisory are known to be affected by these vulnerabilities.
Workarounds: There are no workarounds that address these vulnerabilities.
Fixed Software: Cisco considers any workarounds and mitigations (if applicable) to be temporary solutions until an upgrade to a fixed software release is available. To remediate these vulnerabilities and avoid future exposure as described in this advisory, Cisco strongly recommends that customers upgrade to the fixed software indicated in this advisory.
Fixed Releases
For information about fixed software releases, see the Details section in the bug ID(s) at the top of this advisory.
Vulnerability Policy: To learn about Cisco security vulnerability disclosure policies and publications, see the Security Vulnerability Policy ["http://www.cisco.com/web/about/security/psirt/security_vulnerability_policy.html"]. This document also contains instructions for obtaining fixed software and receiving security vulnerability information from Cisco.
For additional information on Cisco's vulnerability management, disclosure cadence, and software patching strategy, see Cisco's Transition to a Risk-Based Vulnerability Disclosure Model ["https://sec.cloudapps.cisco.com/security/center/resources/risk-based-disclosure"].
Exploitation and Public Announcements: The Cisco Product Security Incident Response Team (PSIRT) is aware that a public announcement is available for the vulnerabilities that are described in this advisory.
The Cisco PSIRT is not aware of any malicious use of the vulnerabilities that are described in this advisory.
Source: Cisco would like to thank Matteo Scarlata, Andris Suter-Dörig, and Kenny Paterson, all of ETH Zurich, for reporting these vulnerabilities.
Legal Disclaimer: SOFTWARE DOWNLOADS AND TECHNICAL SUPPORT
The Cisco Support and Downloads ["https://www.cisco.com/c/en/us/support/index.html"] page on Cisco.com provides information about licensing and downloads. This page can also display customer device support coverage for customers who use the My Devices tool. Please note that customers may download only software that was procured from Cisco directly or through a Cisco authorized reseller or partner and for which the license is still valid.
Customers who purchase directly from Cisco but do not hold a Cisco service contract and customers who make purchases through third-party vendors but are unsuccessful in obtaining fixed software through their point of sale should obtain upgrades by contacting the Cisco Technical Assistance Center (TAC) ["https://www.cisco.com/c/en/us/support/web/tsd-cisco-worldwide-contacts.html"]. Customers should have the product serial number available and be prepared to provide the URL of this advisory as evidence of entitlement to a free upgrade.
When considering software upgrades ["https://sec.cloudapps.cisco.com/security/center/resources/security_vulnerability_policy.html#fixes"], customers are advised to regularly consult the advisories ["https://www.cisco.com/go/psirt"] for the relevant Cisco products to determine exposure and a complete upgrade solution. In all cases, customers should ensure that the devices to be upgraded contain sufficient memory and confirm that current hardware and software configurations will continue to be supported properly by the new release. If the information is not clear, customers are advised to contact the Cisco Technical Assistance Center (TAC) ["https://www.cisco.com/c/en/us/support/web/tsd-cisco-worldwide-contacts.html"] or their contracted maintenance providers.
LEGAL DISCLAIMER DETAILS
CISCO DOES NOT MAKE ANY EXPRESS OR IMPLIED GUARANTEES OR WARRANTIES OF ANY KIND, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. WITHOUT LIMITING THE GENERALITY OF THE FOREGOING, CISCO DOES NOT GUARANTEE THE ACCURACY OR COMPLETENESS OF THIS INFORMATION. THIS DOCUMENT IS PROVIDED ON AN "AS IS" BASIS. YOUR USE OF THE INFORMATION ON THE DOCUMENT OR MATERIALS LINKED FROM THE DOCUMENT IS AT YOUR OWN RISK. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE THIS DOCUMENT AT ANY TIME.
Copies or summaries of the information contained in this Security Advisory may lack important information or contain factual errors. Customers are advised to visit the Cisco Security Advisories ["https://www.cisco.com/go/psirt"] page for the most recent version of this Security Advisory. The Cisco Product Security Incident Response Team (PSIRT) assesses only the affected and fixed release information that is documented in this advisory. See the Cisco Security Vulnerability Policy ["https://sec.cloudapps.cisco.com/security/center/resources/security_vulnerability_policy.html#fixes"] for more information.
5.9 (Medium)
Affected products
Known affected
25 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: CSAFPID-189790 | — |
Vendor Fix
fix
|
|
|
13.0.0-392
Cisco / Cisco Secure Email
|
— |
Vendor Fix
fix
|
|
|
13.5.1-277
Cisco / Cisco Secure Email
|
— |
Vendor Fix
fix
|
|
|
14.0.0-698
Cisco / Cisco Secure Email
|
— |
Vendor Fix
fix
|
|
|
14.2.0-620
Cisco / Cisco Secure Email
|
— |
Vendor Fix
fix
|
|
|
13.0.5-007
Cisco / Cisco Secure Email
|
— |
Vendor Fix
fix
|
|
|
14.3.0-032
Cisco / Cisco Secure Email
|
— |
Vendor Fix
fix
|
|
|
14.2.1-020
Cisco / Cisco Secure Email
|
— |
Vendor Fix
fix
|
|
|
13.5.4-038
Cisco / Cisco Secure Email
|
— |
Vendor Fix
fix
|
|
|
15.0.0-104
Cisco / Cisco Secure Email
|
— |
Vendor Fix
fix
|
|
|
15.0.1-030
Cisco / Cisco Secure Email
|
— |
Vendor Fix
fix
|
|
|
15.5.1-055
Cisco / Cisco Secure Email
|
— |
Vendor Fix
fix
|
|
|
15.5.0-048
Cisco / Cisco Secure Email
|
— |
Vendor Fix
fix
|
|
|
15.5.2-018
Cisco / Cisco Secure Email
|
— |
Vendor Fix
fix
|
|
|
15.0.3-002
Cisco / Cisco Secure Email
|
— |
Vendor Fix
fix
|
|
|
16.0.0-050
Cisco / Cisco Secure Email
|
— |
Vendor Fix
fix
|
|
|
16.0.0-054
Cisco / Cisco Secure Email
|
— |
Vendor Fix
fix
|
|
|
15.5.3-022
Cisco / Cisco Secure Email
|
— |
Vendor Fix
fix
|
|
|
16.0.1-017
Cisco / Cisco Secure Email
|
— |
Vendor Fix
fix
|
|
|
16.0.4-016
Cisco / Cisco Secure Email
|
— |
Vendor Fix
fix
|
|
|
15.5.4-012
Cisco / Cisco Secure Email
|
— |
Vendor Fix
fix
|
|
|
15.0.5-016
Cisco / Cisco Secure Email
|
— |
Vendor Fix
fix
|
|
|
16.0.2-112
Cisco / Cisco Secure Email
|
— |
Vendor Fix
fix
|
|
|
16.0.3-044
Cisco / Cisco Secure Email
|
— |
Vendor Fix
fix
|
|
|
16.5.0-780
Cisco / Cisco Secure Email
|
— |
Vendor Fix
fix
|
5.9 (Medium)
Affected products
Known affected
25 products, the same list as for
CVE-2026-20354
References
8 references
Acknowledgments
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"title": "Exploitation and Public Announcements"
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"title": "Legal Disclaimer"
}
],
"publisher": {
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{
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},
"product_reference": "CSAFPID-301085",
"relates_to_product_reference": "CSAFPID-277395"
},
{
"category": "installed_on",
"full_product_name": {
"name": "Cisco Secure Email 15.0.1-030 when installed on Cisco Secure Email Gateway",
"product_id": "CSAFPID-301640:277395"
},
"product_reference": "CSAFPID-301640",
"relates_to_product_reference": "CSAFPID-277395"
},
{
"category": "installed_on",
"full_product_name": {
"name": "Cisco Secure Email 15.0.3-002 when installed on Cisco Secure Email Gateway",
"product_id": "CSAFPID-303060:277395"
},
"product_reference": "CSAFPID-303060",
"relates_to_product_reference": "CSAFPID-277395"
},
{
"category": "installed_on",
"full_product_name": {
"name": "Cisco Secure Email 15.0.5-016 when installed on Cisco Secure Email Gateway",
"product_id": "CSAFPID-307057:277395"
},
"product_reference": "CSAFPID-307057",
"relates_to_product_reference": "CSAFPID-277395"
},
{
"category": "installed_on",
"full_product_name": {
"name": "Cisco Secure Email 15.5.1-055 when installed on Cisco Secure Email Gateway",
"product_id": "CSAFPID-301641:277395"
},
"product_reference": "CSAFPID-301641",
"relates_to_product_reference": "CSAFPID-277395"
},
{
"category": "installed_on",
"full_product_name": {
"name": "Cisco Secure Email 15.5.0-048 when installed on Cisco Secure Email Gateway",
"product_id": "CSAFPID-301642:277395"
},
"product_reference": "CSAFPID-301642",
"relates_to_product_reference": "CSAFPID-277395"
},
{
"category": "installed_on",
"full_product_name": {
"name": "Cisco Secure Email 15.5.2-018 when installed on Cisco Secure Email Gateway",
"product_id": "CSAFPID-302894:277395"
},
"product_reference": "CSAFPID-302894",
"relates_to_product_reference": "CSAFPID-277395"
},
{
"category": "installed_on",
"full_product_name": {
"name": "Cisco Secure Email 15.5.3-022 when installed on Cisco Secure Email Gateway",
"product_id": "CSAFPID-303202:277395"
},
"product_reference": "CSAFPID-303202",
"relates_to_product_reference": "CSAFPID-277395"
},
{
"category": "installed_on",
"full_product_name": {
"name": "Cisco Secure Email 15.5.4-012 when installed on Cisco Secure Email Gateway",
"product_id": "CSAFPID-307056:277395"
},
"product_reference": "CSAFPID-307056",
"relates_to_product_reference": "CSAFPID-277395"
},
{
"category": "installed_on",
"full_product_name": {
"name": "Cisco Secure Email 16.0.0-050 when installed on Cisco Secure Email Gateway",
"product_id": "CSAFPID-303062:277395"
},
"product_reference": "CSAFPID-303062",
"relates_to_product_reference": "CSAFPID-277395"
},
{
"category": "installed_on",
"full_product_name": {
"name": "Cisco Secure Email 16.0.0-054 when installed on Cisco Secure Email Gateway",
"product_id": "CSAFPID-303063:277395"
},
"product_reference": "CSAFPID-303063",
"relates_to_product_reference": "CSAFPID-277395"
},
{
"category": "installed_on",
"full_product_name": {
"name": "Cisco Secure Email 16.0.1-017 when installed on Cisco Secure Email Gateway",
"product_id": "CSAFPID-303305:277395"
},
"product_reference": "CSAFPID-303305",
"relates_to_product_reference": "CSAFPID-277395"
},
{
"category": "installed_on",
"full_product_name": {
"name": "Cisco Secure Email 16.0.4-016 when installed on Cisco Secure Email Gateway",
"product_id": "CSAFPID-307007:277395"
},
"product_reference": "CSAFPID-307007",
"relates_to_product_reference": "CSAFPID-277395"
},
{
"category": "installed_on",
"full_product_name": {
"name": "Cisco Secure Email 16.0.2-112 when installed on Cisco Secure Email Gateway",
"product_id": "CSAFPID-307058:277395"
},
"product_reference": "CSAFPID-307058",
"relates_to_product_reference": "CSAFPID-277395"
},
{
"category": "installed_on",
"full_product_name": {
"name": "Cisco Secure Email 16.0.3-044 when installed on Cisco Secure Email Gateway",
"product_id": "CSAFPID-307059:277395"
},
"product_reference": "CSAFPID-307059",
"relates_to_product_reference": "CSAFPID-277395"
},
{
"category": "installed_on",
"full_product_name": {
"name": "Cisco Secure Email 16.5.0-780 when installed on Cisco Secure Email Gateway",
"product_id": "CSAFPID-309085:277395"
},
"product_reference": "CSAFPID-309085",
"relates_to_product_reference": "CSAFPID-277395"
}
]
},
"vulnerabilities": [
{
"cve": "CVE-2026-20354",
"ids": [
{
"system_name": "Cisco Bug ID",
"text": "CSCwu28364"
}
],
"notes": [
{
"category": "other",
"text": "Complete.",
"title": "Affected Product Comprehensiveness"
}
],
"product_status": {
"known_affected": [
"CSAFPID-189790",
"CSAFPID-286755",
"CSAFPID-286761",
"CSAFPID-286790",
"CSAFPID-289314",
"CSAFPID-292686",
"CSAFPID-292688",
"CSAFPID-292690",
"CSAFPID-292691",
"CSAFPID-301085",
"CSAFPID-301640",
"CSAFPID-301641",
"CSAFPID-301642",
"CSAFPID-302894",
"CSAFPID-303060",
"CSAFPID-303062",
"CSAFPID-303063",
"CSAFPID-303202",
"CSAFPID-303305",
"CSAFPID-307007",
"CSAFPID-307056",
"CSAFPID-307057",
"CSAFPID-307058",
"CSAFPID-307059",
"CSAFPID-309085"
]
},
"remediations": [
{
"category": "vendor_fix",
"details": "Cisco has released software updates that address this vulnerability.",
"product_ids": [
"CSAFPID-189790",
"CSAFPID-286755",
"CSAFPID-286761",
"CSAFPID-286790",
"CSAFPID-289314",
"CSAFPID-292686",
"CSAFPID-292688",
"CSAFPID-292690",
"CSAFPID-292691",
"CSAFPID-301085",
"CSAFPID-301640",
"CSAFPID-301641",
"CSAFPID-301642",
"CSAFPID-302894",
"CSAFPID-303060",
"CSAFPID-303062",
"CSAFPID-303063",
"CSAFPID-303202",
"CSAFPID-303305",
"CSAFPID-307007",
"CSAFPID-307056",
"CSAFPID-307057",
"CSAFPID-307058",
"CSAFPID-307059",
"CSAFPID-309085"
],
"url": "https://software.cisco.com"
}
],
"scores": [
{
"cvss_v3": {
"baseScore": 5.9,
"baseSeverity": "MEDIUM",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N",
"version": "3.1"
},
"products": [
"CSAFPID-189790",
"CSAFPID-286755",
"CSAFPID-286761",
"CSAFPID-286790",
"CSAFPID-289314",
"CSAFPID-292686",
"CSAFPID-292688",
"CSAFPID-292690",
"CSAFPID-292691",
"CSAFPID-301085",
"CSAFPID-301640",
"CSAFPID-301641",
"CSAFPID-301642",
"CSAFPID-302894",
"CSAFPID-303060",
"CSAFPID-303062",
"CSAFPID-303063",
"CSAFPID-303202",
"CSAFPID-303305",
"CSAFPID-307007",
"CSAFPID-307056",
"CSAFPID-307057",
"CSAFPID-307058",
"CSAFPID-307059",
"CSAFPID-309085"
]
}
],
"title": "Cisco Secure Email S/MIME Ciphertext Decryption Vulnerabilty"
},
{
"cve": "CVE-2026-20355",
"ids": [
{
"system_name": "Cisco Bug ID",
"text": "CSCwu28362"
}
],
"notes": [
{
"category": "other",
"text": "Complete.",
"title": "Affected Product Comprehensiveness"
}
],
"product_status": {
"known_affected": [
"CSAFPID-189790",
"CSAFPID-286755",
"CSAFPID-286761",
"CSAFPID-286790",
"CSAFPID-289314",
"CSAFPID-292686",
"CSAFPID-292688",
"CSAFPID-292690",
"CSAFPID-292691",
"CSAFPID-301085",
"CSAFPID-301640",
"CSAFPID-301641",
"CSAFPID-301642",
"CSAFPID-302894",
"CSAFPID-303060",
"CSAFPID-303062",
"CSAFPID-303063",
"CSAFPID-303202",
"CSAFPID-303305",
"CSAFPID-307007",
"CSAFPID-307056",
"CSAFPID-307057",
"CSAFPID-307058",
"CSAFPID-307059",
"CSAFPID-309085"
]
},
"remediations": [
{
"category": "vendor_fix",
"details": "Cisco has released software updates that address this vulnerability.",
"product_ids": [
"CSAFPID-189790",
"CSAFPID-286755",
"CSAFPID-286761",
"CSAFPID-286790",
"CSAFPID-289314",
"CSAFPID-292686",
"CSAFPID-292688",
"CSAFPID-292690",
"CSAFPID-292691",
"CSAFPID-301085",
"CSAFPID-301640",
"CSAFPID-301641",
"CSAFPID-301642",
"CSAFPID-302894",
"CSAFPID-303060",
"CSAFPID-303062",
"CSAFPID-303063",
"CSAFPID-303202",
"CSAFPID-303305",
"CSAFPID-307007",
"CSAFPID-307056",
"CSAFPID-307057",
"CSAFPID-307058",
"CSAFPID-307059",
"CSAFPID-309085"
],
"url": "https://software.cisco.com"
}
],
"scores": [
{
"cvss_v3": {
"baseScore": 5.9,
"baseSeverity": "MEDIUM",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N",
"version": "3.1"
},
"products": [
"CSAFPID-189790",
"CSAFPID-286755",
"CSAFPID-286761",
"CSAFPID-286790",
"CSAFPID-289314",
"CSAFPID-292686",
"CSAFPID-292688",
"CSAFPID-292690",
"CSAFPID-292691",
"CSAFPID-301085",
"CSAFPID-301640",
"CSAFPID-301641",
"CSAFPID-301642",
"CSAFPID-302894",
"CSAFPID-303060",
"CSAFPID-303062",
"CSAFPID-303063",
"CSAFPID-303202",
"CSAFPID-303305",
"CSAFPID-307007",
"CSAFPID-307056",
"CSAFPID-307057",
"CSAFPID-307058",
"CSAFPID-307059",
"CSAFPID-309085"
]
}
],
"title": "Cisco Secure Email S/MIME Ciphertext Decryption Vulnerabilty"
}
]
}
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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.
Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.