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NVD / CVE Program· CNA cisco

CVE-2025-20393: Cisco Secure Email Gateway and Cisco Secure Email and Web Manager Remote Command Execution Vulnerability

CriticalCVSS 10.0 · v3.1KEVWeaponized No fix recorded

Noroxi assessment

Priority: Now (action score 80/100)

  • CISA has confirmed exploitation in the wild (Dec 17, 2025). Remediation deadline for US federal agencies: Dec 24, 2025.
  • Probability of exploitation in the next 30 days: 32.3% (FIRST EPSS); higher than 98.3% of all records.
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • According to CISA the attack is automatable: targets can be found by mass scanning.
  • According to the record, no fixed version is available yet.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Patch today or shut off access. Until a fix is released, restrict access to the affected component and follow the vendor's advisory.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · CISA KEV · FIRST EPSS

A vulnerability in the Spam Quarantine feature of Cisco AsyncOS Software for Cisco Secure Email Gateway and Cisco Secure Email and Web Manager could allow an unauthenticated, remote attacker to execute arbitrary system commands on an affected device with root privileges. This vulnerability is due to insufficient validation of HTTP requests by the Spam Quarantine feature. An attacker could exploit this vulnerability by sending a crafted HTTP request to the affected device. A successful exploit could allow the attacker to execute arbitrary commands on the underlying operating system with root privileges.

Published
Dec 17, 2025
Updated
Oct 7, 2026
EPSS
32.3% · 98th percentile

Report tools

JSON

Action score

80

Now

Patch today or shut off access.

CVSS
40 / 40 · 10.0 / 10
CISA KEV
30 / 30 · Listed
EPSS
10 / 30 · 32.3%

CISA SSVC decision

Exploitation
active
Automatable
yes
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · cisco
10.0
NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Actively exploited in the wild

CISA added this to its Known Exploited Vulnerabilities catalog on Dec 17, 2025. That signals real attacks, not theory.

Remediation deadline for US federal agencies: Dec 24, 2025.

Get told when this record changes

  • In CISA KEV: exploitation in the wild confirmed
  • Weaponized exploit exists
  • No fixed version yet

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2025-20393

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Is your version affected? Check it

Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
ciscoasyncos
ciscosecure email gateway virtual appliance c100v
ciscosecure email gateway virtual appliance c300v
ciscosecure email gateway virtual appliance c600v
ciscosecure email gateway c195
ciscosecure email gateway c395
ciscosecure email gateway c695
ciscosecure email and web manager virtual appliance m100v
ciscosecure email and web manager virtual appliance m300v
ciscosecure email and web manager virtual appliance m600v
ciscosecure email and web manager m170
ciscosecure email and web manager m190

and 9 more

Versions reported by the vendor

Affected version ranges reported by the assigning authority (cisco). Independent of NVD's CPE analysis and usually ahead of it.

  • Cisco Cisco Secure Email

    • 14.0.0-698, 13.5.1-277, 13.0.0-392, 14.2.0-620, 13.0.5-007, 13.5.4-038, 14.2.1-020, 14.3.0-032, 15.0.0-104, 15.0.1-030, 15.5.0-048, 15.5.1-055 … (+6)affected

  • Cisco Cisco Secure Email and Web Manager

    • 13.6.2-023, 13.6.2-078, 13.0.0-249, 13.0.0-277, 13.8.1-052, 13.8.1-068, 13.8.1-074, 14.0.0-404, 12.8.1-002, 14.1.0-227, 13.6.1-201, 14.2.0-203 … (+14)affected
Affected versions · NVD (6)

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • cisco asyncosbefore 15.0.5-016
  • cisco asyncos15.5 and later · before 15.5.4-012
  • cisco asyncos16.0 and later · before 16.0.4-016
  • cisco asyncosbefore 15.0.2-007
  • cisco asyncos15.5 and later · before 15.5.4-007
  • cisco asyncos16.0 and later · before 16.0.4-010

Same product

cisco: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-76461Cisco Secure Email Gateway SQL Injection VulnerabilityKEV
    81Now
  • CVE-2026-76519Cisco Secure Email Gateway Arbitrary File Write VulnerabilityKEV
    71This week
  • CVE-2022-20871Cisco Secure Web Appliance Privilege Escalation Vulnerability
    36Monitor

Published before and after this one in the same product

  • ← EarlierCVE-2025-20184Feb 5, 2025 · Cisco Secure Email and Web Manager and Secure Web Appliance Command Injection Vulnerability
    28Monitor
  • ← EarlierCVE-2025-20185Feb 5, 2025 · Cisco Secure Email and Web Manager, Secure Email Gateway, and Secure Web Appliance Privilege Escalation Vulnerability
    26Monitor
  • ← EarlierCVE-2020-3122Mar 4, 2025 · Cisco Content Security Management Appliance Information Disclosure Vulnerability
    21Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

No fix version is recorded for this entry. Check the references for vendor advisories.

Exploit status

Weaponized

A ready exploit tool or active in-the-wild use is known for this vulnerability. This should be your top priority.

Evidence

  • Proof-of-concept repository on GitHub ×5

Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.

Public exploit evidence
SourceKindDate
Proof-of-concept repository on GitHub5 repositories2025-12-18 → 2026-01-16

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

  1. CISA KEV-1 d
  2. Published
  3. First PoCsame day
  4. TodayNov 12, 2026+330 d
EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2025-20184315 days apartCisco Secure Email and Web Manager and Secure Web Appliance Command Injection Vulnerability
    28Monitor
  • CVE-2025-20183315 days apartCisco Secure Web Appliance Range Request Bypass Vulnerability
    21Monitor

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

Not on record for this CVE: patch commit or PR link · researcher credit · public bounty program.

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted

Impact can extend beyond the vulnerable component (scope changes).

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Changed
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-20 · Improper Input Validation

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

References

Show all references (1 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records