CVE-2019-12495
CVE-2019-12495 is a medium-severity vulnerability in Tinycc with a CVSS 3.x base score of 5.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-787.
Key facts
- Severity: Medium (CVSS 3.x base score 5.5)
- CVSS v2: 4.3
- EPSS exploit prediction: 1% (65th percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-787
- Affected product: Tinycc
- Published:
- Last modified:
Description
An issue was discovered in Tiny C Compiler (aka TinyCC or TCC) 0.9.27. Compiling a crafted source file leads to a one-byte out-of-bounds write in the gsym_addr function in x86_64-gen.c. This occurs because tccasm.c mishandles section switches.
Frequently asked questions
- What is CVE-2019-12495?
- An issue was discovered in Tiny C Compiler (aka TinyCC or TCC) 0.9.27. Compiling a crafted source file leads to a one-byte out-of-bounds write in the gsym_addr function in x86_64-gen.c. This occurs because tccasm.c mishandles section switches.
- How severe is CVE-2019-12495?
- CVE-2019-12495 has a CVSS 3.x base score of 5.5, rated medium severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity none, and availability high.
- Is CVE-2019-12495 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (65th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2019-12495?
- CVE-2019-12495 affects Tinycc. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2019-12495?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
- When was CVE-2019-12495 published?
- CVE-2019-12495 was published on 2019-05-31 and last updated on 2026-06-17.
References
- http://www.securityfocus.com/bid/108541
- https://lists.nongnu.org/archive/html/tinycc-devel/2019-05/msg00044.html
- https://repo.or.cz/tinycc.git/commit/d04ce7772c2bc2781ab2502e0b1f1964488814b5
Affected products (1)
- cpe:2.3:a:tinycc:tinycc:0.9.27:*:*:*:*:*:*:*
More vulnerabilities in Tinycc
- CVE-2019-9754 — Medium (CVSS 5.5): An issue was discovered in Tiny C Compiler (aka TinyCC or TCC) 0.9.27. Compiling a crafted source file leads to an 1…
- CVE-2018-20376 — Medium (CVSS 5.5): An issue was discovered in Tiny C Compiler (aka TinyCC or TCC) 0.9.27. Compiling a crafted source file leads to an 8…
- CVE-2018-20375 — Medium (CVSS 5.5): An issue was discovered in Tiny C Compiler (aka TinyCC or TCC) 0.9.27. Compiling a crafted source file leads to an 8…
- CVE-2018-20374 — Medium (CVSS 5.5): An issue was discovered in Tiny C Compiler (aka TinyCC or TCC) 0.9.27. Compiling a crafted source file leads to an 8…
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