The htcpHandleTstRequest function in htcp.c in Squid 2.x before 2.6.STABLE24 and 2.7 before 2.7.STABLE8, and htcp.cc in 3.0 before 3.0.STABL
The htcpHandleTstRequest function in htcp.c in Squid 2.x before 2.6.STABLE24 and 2.7 before 2.7.STABLE8, and htcp.cc in 3.0 before 3.0.STABLE24, allows remote attackers to cause a denial of service (NULL pointer dereference and daemon crash) via crafted packets to the HTCP port.
- Published
- Feb 15, 2010
- Updated
- Jun 16, 2026
- EPSS
- 31.1% · 98th percentile
- CWE
- —
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Report tools
Action score
29
Monitor
Low priority for now.
- CVSS
- 20 / 40 · 5.0 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 9 / 30 · 31.1%
Affected systems
| Vendor | Product | CPE |
|---|---|---|
| squid-cache | squid | cpe:2.3:a:squid-cache:squid |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- squid-cache squid2.0
- squid-cache squid2.1
- squid-cache squid2.2
- squid-cache squid2.3
- squid-cache squid2.4
- squid-cache squid2.5
- squid-cache squid2.6
- squid-cache squid2.7
- squid-cache squid3.0
- squid-cache squid3.0.stable1
- squid-cache squid3.0.stable11
- squid-cache squid3.0.stable12
- squid-cache squid3.0.stable13
- squid-cache squid3.0.stable14
- squid-cache squid3.0.stable15
- squid-cache squid3.0.stable16
- squid-cache squid3.0.stable17
- squid-cache squid3.0.stable18
- squid-cache squid3.0.stable19
- squid-cache squid3.0.stable2
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| Debian:12 | squid | before 2.7.STABLE8-1 | 2.7.STABLE8-1 |
Same product
squid-cache: all recordsOther highest-scoring records for the same primary product.
- CVE-2023-46847Squid: denial of service in http digest authentication57Plan
- CVE-2024-25617Denial of Service in HTTP Header parser in squid proxy56Plan
- CVE-2023-49285Denial of Service in HTTP Message Processing in Squid56Plan
- CVE-2021-31806An issue was discovered in Squid before 4.15 and 5.x before 5.0.6.55Plan
- CVE-2020-8450An issue was discovered in Squid before 4.10.51Plan
- CVE-2024-25111SQUID-2024:1 Denial of Service in HTTP Chunked Decoding50Plan
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| debian:squid | 2.7.STABLE8-1 · Debian:12 | Package registry (OSV) |
Exploit status
No known public exploit
No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.
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.
No dated events beyond publication.
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
No credits in the CNA record.
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
No nightly-computed relations.
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
—
Bug bounty scope
No known public program.
Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).
Technical details
Attack conditions
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- none
- Integrity
- none
- Availability
- P · the service can be disrupted
- Attack complexity
- Low
- Confidentiality impact
- None
- Integrity impact
- None
- Availability impact
- P
Weakness class (CWE)
—
CVSS vector
AV:N/AC:L/Au:N/C:N/I:N/A:P
nvd-primary
Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
MITRE has no CAPEC/ATT&CK mapping for this CWE.
Noroxi analysis
No Noroxi analysis for this record yet
We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.
We use this product, ask for helpChange log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
- bugs.squid-cache.org/show_bug.cgi?id=2858
- lists.fedoraproject.org/pipermail/package-announce/2010-February/035961.html
- lists.fedoraproject.org/pipermail/package-announce/2010-March/037159.html
- osvdb.org/62297
- secunia.com/advisories/38812
- www.securityfocus.com/bid/38212
- www.securitytracker.com/id?1023587
- www.squid-cache.org/Advisories/SQUID-2010_2.txt
- www.squid-cache.org/Versions/v2/2.7/changesets/12600.patch
- www.squid-cache.org/Versions/v3/3.0/changesets/3.0-ADV-2010_2.patch
- www.vupen.com/english/advisories/2010/0371
- www.vupen.com/english/advisories/2010/0603
Vendor advisories and official records. Exploit/PoC links are deliberately left out.