CVE-2025-15079: libssh global known_hosts override

15

Low

Who exploits it and how urgent it is

A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.

No exploitation signal in the sources consulted so far.

How the score was calculated

EPSS 0.6% (30-day exploitation probability)+7
Technical severity (medium)+3
CISA SSVC: exploitation "poc"+5

The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.

Exploitation

Not confirmed

Not in CISA KEV — an absence of record, not proof it is unexploited.

EPSS FIRST

0.55%

ahead of 45% of scored CVEs · Oct 14, 2026

Affects

Curl

CVSS base

5.3

Medium · 3 source(s)

CISA SSVC assessment CISA

Three decision points CISA publishes for the CVEs it assesses (SSVC 2.0.3). A stakeholder decision, not a severity score.

Exploitation

Proof of concept

none · proof-of-concept · active

Automatable

No

can an attacker script the kill-chain steps

Technical impact

Partial

partial · total control of the vulnerable component

Remediation

Fixes and mitigations documented by the sources — linked to the original advisory.

Documented patch — curl.se (NIST National Vulnerability Database)
Documented patch — www.openwall.com (NIST National Vulnerability Database)

First 24 hours

Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.

Identify exposed assets running the affected vendor/product/version combinations (Curl Curl, Haxx Curl).
The attack is network-based and needs no privileges: restrict exposure (ACLs, VPN, WAF) until patched.
Apply the fixed version or the patch documented under Remediation.
Exploitation requires user interaction: tighten email/web filtering and warn affected users.
Search available logs for exploit probes, errors and authentication anomalies.

Affected scope

Vendor, product and versions as the sources word them.

Vendor	Product	Versions	Status	Source
Curl	Curl	version 7.78.0version 7.71.0version 7.71.1version 7.72.0version 7.73.0version 7.74.0version 7.75.0version 7.76.0 and 66 more version 7.76.1version 7.77.0version 7.70.0version 7.79.0version 7.79.1version 7.80.0version 7.81.0version 7.82.0version 7.83.0version 7.83.1version 7.84.0version 7.65.0version 7.58.0version 7.59.0version 7.60.0version 7.61.0version 7.61.1version 7.62.0version 7.63.0version 7.64.0version 7.64.1version 7.85.0version 7.65.1version 7.65.2version 7.65.3version 7.66.0version 7.67.0version 7.68.0version 7.69.0version 7.69.1version 8.14.0version 8.9.0version 8.9.1version 8.10.0version 8.10.1version 8.11.0version 8.11.1version 8.12.0version 8.12.1version 8.13.0version 8.8.0version 8.14.1version 8.15.0version 8.16.0version 8.17.0≥ c92d2e14cfb0db662f958effd2ac86f995cf1b5a and < adca486c125d9a6d9565b9607a19dce803a8b479≥ 8.17.0 and < 8.18.0≥ 8.15.0 and < 8.16.1≥ 7.58.0 and < 8.14.2version 8.1.2version 7.86.0version 7.87.0version 7.88.0version 7.88.1version 8.0.0version 8.0.1version 8.1.0version 8.1.1version 8.2.0version 8.2.1version 8.3.0version 8.4.0version 8.5.0version 8.6.0version 8.7.0version 8.7.1	Vulnerable	CVE Program (cve.org) e CISA ADP
Haxx	Curl	≥ 7.58.0 and < 8.18.0	Vulnerable	NIST National Vulnerability Database

Attack characteristics

The CVSS vector, decoded. It describes the attack, not your exposure to it.

Attack vector

Network

Attack complexity

High

Privileges required

None

User interaction

Required

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None

Every base score collected

Sources score independently and may disagree; each row says who scored it and under which version.

Score	Version	Severity	Expl.	Impact	Scored by
5.3	CVSS 3.1	Medium	1.6	3.6	134c704f-9b21-4f2e-91b3-4a467353bcc0 via NIST National Vulnerability Database
5.3	CVSS 3.1	Medium	—	—	GitHub, Inc. via GitHub Security Advisories
5.3	CVSS 3.1	Medium	—	—	CISA-ADP via CVE Program (cve.org) e CISA ADP

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N (score shown at the top: 134c704f-9b21-4f2e-91b3-4a467353bcc0)

Weakness MITRE

Weakness class according to MITRE’s CWE catalog.

CWE-297

Other CVEs with this weakness →

EPSS over time FIRST

Oct 13, 2026 → Oct 14, 2026 · 2 reading(s) · max 0.55%

Detection

Read off the CVSS vector and the weakness class. Starting points, not tested rules.

Prioritize edge telemetry for the network-reachable component (proxy, WAF, IDS/IPS).

web/proxy/WAF logsnetwork IDS/IPS

Timeline

What happened to this CVE, newest first.

2026
Affected products added · curl/curl
Oct 13, 2026 · CVE Program (cve.org) e CISA ADP
SSVC assessment updated
Oct 13, 2026 · CVE Program (cve.org) e CISA ADP
Record published
Oct 13, 2026
Fix documented
Oct 13, 2026 · NIST National Vulnerability Database
CVSS changed · 5.3
Oct 13, 2026 · NIST National Vulnerability Database
Source status changed · → Modified
Oct 13, 2026 · NIST National Vulnerability Database
Record created in this database
Oct 13, 2026 · NIST National Vulnerability Database
CVE published
Jan 8, 2026 · curl

Source activity

Repeated readings are counted rather than listed.

1× References added · Oct 14, 2026 – Oct 14, 2026
1× Official description updated · Oct 13, 2026 – Oct 13, 2026

References

6 on the record

curl.se/docs/CVE-2025-15079.json
Vendor Advisory, NIST National Vulnerability Database
www.openwall.com/lists/oss-security/2026/01/07/6
Mailing List, Patch, Third Party Advisory, NIST National Vulnerability Database
curl.se/docs/CVE-2025-15079.html
Patch, Vendor Advisory, NIST National Vulnerability Database
github.com/advisories/GHSA-7q9p-cx8r-rh2q
GitHub Security Advisories
nvd.nist.gov/vuln/detail/CVE-2025-15079
GitHub Security Advisories
hackerone.com/reports/3477116
Exploit, Issue Tracking, Third Party Advisory, NIST National Vulnerability Database

Elsewhere on this site

Curl
every CVE for this vendor

CWE-297
other pages naming this weakness

Related CVEs (same products)

High CVE-2026-92392 HTTP/2 upload Use-After-Free 1d
Critical CVE-2026-9079 stale proxy password leak Jul 3, 2026
Critical CVE-2026-8927 env-set cross-proxy Digest auth state leak Jul 3, 2026
High CVE-2026-8932 incomplete mTLS config matching in conn reuse Jul 3, 2026
High CVE-2026-9545 exposing HTTP/3 early data Jul 3, 2026
High CVE-2026-9080 UAF after pause in socket callback Jul 3, 2026

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record

Text assembled only from the fields above — no additional claims.

What should defenders know first?

CVE-2025-15079 is "libssh global known_hosts override", rated Medium. It affects Curl (Curl); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. CVSS 5.3 describes technical severity. EPSS 0.55% estimates the probability of exploitation in 30 days; neither replaces your asset context. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.

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